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desktop PC power supply questions

I have some questions regarding my eMachines 400i desktop (the power supply).

I've had it since 2001. I think around 2 years back it couldn't turn on one day, until I swapped the surge protector switch thinking it was a power issue. I assume that means the old surge protector no longer sources enough current to the desktop PC?

Now, here's the real question. Due to a lack of space, I cram some equipment onto a surge protector. All's fine until I added a DSL modem to the pack. The desktop still works ok. But half of the time, when it's off, it makes a hissing/humming noise like a quite fan I guess. I've never seen it like this until I added the DSL modem to the outlet. Is this just electrical interference from the modem or does it mean my load is too big on the circuit and the desktop is a bit under-powered? Or is the power supply slowly dying out due to old age? I did an estimate of the circuit load to be around 12A, no more than 15A.

FYI: equipment plugged into circuit includes: CRT monitor (~1A or 110W?), desktop PC (~6A or 600W?), laser printer (2A, but off most of the time), print server (0.2A), wireless router (0.5A), dsl modem (1A), and cordless phone.
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daluu
Asked:
daluu
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1 Solution
 
CallandorCommented:
Any unusual noises cropping up is not a good sign.  You can test whether this was caused by the DSL modem by unplugging everything except the PC and monitor and starting it up - does it still make that noise?  Keep in mind surge protectors do their work silently, and this one may have absorbed a few surges, even while you weren't there.  After enough hits, it will cease to work, and that sound may be a sign that it has been degraded.  You can also try a different surge protector.
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daluuAuthor Commented:
ok, thanx for the info. btw, does a surge protector with a blinking LED light switch indicate that its starting to cease to work.
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CallandorCommented:
That is definitely a bad sign - the LEDs are supposed to be constant.
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daluuAuthor Commented:
I tried taking out all the stuff but the PC and the monitor - still has the noise. I replaced the surge protector with a new one. Still get the noise. Does that mean the PC's power supply is going bad? I'm using that PC right now to write this message, so I'm ok for now at least.
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CallandorCommented:
If you can isolate the sound as coming from the power supply, then I would say yes, it's starting to go bad.  You don't want to take chances with power supplies, because when they fail, they can affect everything connected to it - a very expensive repair job.
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